#!/bin/bash

usage() {
	cat <<-EOF
	backup-dvd [options]

	Options:
	 -i <input dev>      Defaults to ${dev}
	 -o <output dir>     Defaults to ${out}
	 -n <volume name>    Defaults to volume on disk
	EOF
	exit ${1:-0}
}

dev=/dev/cdrom
out=${PWD}
vol=

eval set -- `getopt -- hi:n:o: "$@"`
while [[ -n $1 ]] ; do
	case $1 in
		-h) usage;;
		-i) dev=$2; shift 2;;
		-o) out=$2; shift 2;;
		-n) vol=$2; shift 2;;
		--) shift; break;;
		-*) usage 1;;
		*)  usage 2; break;;
	esac
done

# iso-info		mkisofs
Application=	# -A
Preparer=		# -p
Publisher=		# -publisher
System=			# -sysid
Volume=${vol}	# -V
Volume_Set=		# -volset

if [[ -z ${Volume} ]] ; then
	info=$(iso-info ${dev}) || exit 1

	eval $(echo "${info}" | awk -F: '
		(NF > 1 && $1 !~ /image/) {
			sub(/ *$/, "", $1);
			sub(/ /, "_", $1);
			sub(/^ */, "", $2);
			print $1 "=\"" $2 "\"";
	}')
fi

if [[ -z ${Volume} ]] ; then
	echo "Unable to parse Volume out of ISO"
	iso-info ${dev}
fi

echo "Backing up: ${Volume}"

e() {
	for a ; do
		[[ ${a} == *" "* || ${#a} == 0 ]] && fmt='"%s"' || fmt='%s'
		printf "${fmt} " "${a}"
	done
	echo
	"$@"
}
opts=(
	-i ${dev}
	-o "${out}"
	-n "${Volume}"
)
if ! e dvdbackup -M "${opts[@]}" ; then
	e dvdbackup -F "${opts[@]}" || exit 1
fi
e mkisofs -quiet -dvd-video \
	-A "${Application}" \
	-p "${Preparer}" \
	-publisher "${Publisher}" \
	-sysid "${System}" \
	-V "${Volume}" \
	-volset "${Volume_Set}" \
	-o "${out}/${Volume}.iso" "${Volume}"
du -h "${out}/${Volume}.iso"

exec eject